Crane of structure: bridge cranes. Can work in a rectangular field and over 30 tons truck crane company, and more for workshops, warehouses, open yard loading and unloading goods, etc. Guangdong 30 tons truck crane, the beam cranes, bridge cranes, Cranes bridge, carrying bridges. Girder cranes: Beam cranes including single girder crane and double girder bridge crane. Crane means within a certain range vertical lifting and carrying heavy loads of horizontal multi-action lifting machinery. Also known as cable car. It belongs to material handling machinery. Working characteristics of the crane is doing intermittent movement, that in a work cycle Reclaimer, transport, unloading and other movements of the respective agencies are working alternately, development and use of cranes on the market more widely.